Waste-Heat-Driven Refrigerant Compression in Air Conditioning
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Solution Overview
Problem
Conventional air conditioning systems are inefficient in energy consumption, as they discard low-grade heat generated during the refrigeration process, which could be utilized to supplement the compression requirements, thereby increasing energy usage and environmental impact.
Innovation Solution
The proposed air conditioning system incorporates an energy recovery sub-system that utilizes the heat generated during the refrigeration process to drive a mechanical force, which is used to supplement the compression of refrigerant, reducing the electrical energy needed to operate the compressor by using an energy recovery fluid and expansion motor to generate a mechanical force that aids in compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional air conditioning systems discard low-grade heat generated during refrigeration, then the system structure remains simple, but energy consumption increases and environmental impact worsens
Solution Approach 1:
The patent converts the previously discarded low-grade heat from the refrigeration process into a useful resource by channeling it through a heat engine to generate mechanical work that drives the compressor, thereby transforming waste heat into beneficial compression power and reducing overall energy consumption
Solution Approach 2:
The patent merges the refrigeration cycle with a heat engine cycle, combining the compressor, condenser, evaporator, and heat engine into an integrated system where the heat rejected by the refrigerant is immediately utilized to drive the heat engine, which in turn drives the compressor, creating a coupled thermodynamic system
2Power
If electrical energy is used to drive the compressor, then compression is achieved, but energy consumption increases
Solution Approach 1:
The system achieves self-service by using its own internally generated heat to power its own compression requirements through the heat engine, reducing dependence on external electrical energy sources and creating a partially self-sustaining thermodynamic cycle
Solution Approach 2:
The patent replaces the electrical motor-driven compression system with a heat engine-driven compression system, substituting electrical energy conversion with direct thermal-to-mechanical energy conversion, thereby eliminating the need for external electrical power input for compression
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the electrical energy required for compressor operation, enhancing the overall efficiency of the air conditioning system by leveraging low-grade heat as a driving force for compression, thereby minimizing energy consumption and environmental impact.
Implementation Method 1
a heat engine operable to receive the heat from the refrigerant and generate a mechanical force
Implementation Method 2
the refrigerant changes phase based on its location along the line and the conditions at that location
Implementation Method 3
removes heat from the vapor and thus causes it to condense, thereby causing the vapor that was inlet to experience a phase change to liquid
Data Source
AI summary
An air conditioning system. The system includes apparatus for circulating a refrigerant in a path, further having apparatus for compressing the refrigerant and generating heat in the refrigerant. The system further includes apparatus for providing a driving force to the apparatus for compressing in response to the generated heat.